Hour Meter Gear Replacment - Odometer Gears
Hour Meter Gear Replacment - Odometer Gears
Hour Meter Gear Replacment - Odometer Gears
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www.<strong>Odometer</strong><strong>Gear</strong>s.com<br />
Fryedaze<br />
Dave & Betsy<br />
http://home.comcast.net/~davebetsy/site/?/page/VDO_Tach%2Fhour_meter_gear_replacement_%5B1987_VDO_81<br />
_117_377%5D/<br />
VDO Tach/hour meter gear replacement [1987 VDO 81 117 377]<br />
VDO TACH/HOUR METER GEAR REPLACEMENT [1987 VDO 81 117 377]<br />
{NOTES ADDED WITH ODG: AT THE BEGINNING OF THE LINE WHERE ADDED BY ODOMETER GEARS LTD}
www.<strong>Odometer</strong><strong>Gear</strong>s.com<br />
{ODG: take a picture or make a mark to where the needle points before removing. There is an<br />
internal stop with this style Tachometer/hour meter: no needle rest. Gently hold the center of the<br />
needle and gently rotate counter-clockwise. You may have to make several revolutions and the<br />
needle will start to feel loose. Gently use your first finger and thumb to pluck the needle off. The<br />
small shaft that the needle is pressed onto can be damaged if you try to just pull the needle<br />
straight off. }
www.<strong>Odometer</strong><strong>Gear</strong>s.com
www.<strong>Odometer</strong><strong>Gear</strong>s.com<br />
{ODG: The amber colored gear comes in six different tooth counts. You have to count the teeth on<br />
your old gear before ordering. 20x21, 20x22, 20x23, 20x29, 20x30 or 20x32 these can be ordered<br />
directly through <strong>Odometer</strong> <strong>Gear</strong>s LTD:<br />
http://www.odometergears.com/products/<strong>Hour</strong>+<strong>Meter</strong>+%28VDO%29/All/28}<br />
{ODG: Use a small punch or screw driver and press the metal shaft out of the center of this gear,<br />
remove gear. It is friction fit.}
www.<strong>Odometer</strong><strong>Gear</strong>s.com<br />
{ODG: Remove the c-clip that secures this gear and the amber gear. Be careful and place a cloth<br />
over the unit when removing so that you do not loss the clips. Clean the shaft that the amber gear<br />
rides on as any residue from the old waxy gear can cause the unit to either work erratically or not<br />
at all. It is also recommended to inspect the hour numbers as well as the main housing and works<br />
for any flakes or debris of the old gear and remove. }<br />
I DO NOT recommend using a Dremel to run the numbers forward. I had 300 hours on one tach<br />
and 700 hrs. on the other. I saw some gear wear on the second tach. The stepper gears hammer<br />
the number wheel gears too hard when they spin that fast. I pulled the shaft on the stepper for the<br />
second tach, set numbers; scotch tapped in place and reinserted the shaft pin. {ODG: You can<br />
also use an air compressor with an air nozzle. Blow air on the same gear like a pin wheel. In one<br />
direction you will add time and the other direction you will subtract time.}
www.<strong>Odometer</strong><strong>Gear</strong>s.com<br />
{ODG: Install the gears in reverse order. Reinstall the c-clips and metal shaft. Reinstall in the<br />
housing. Install face and just snug the screws for the face as they can be damaged very easily.<br />
When installing the needle, place as close to the original location as you can. If the needle points a<br />
little high just rotate the needle holding the pivot point of the needle counter-clockwise until it is<br />
aligned. If the needle point low, gently rotate the needle past the top rpm reading and you will hit<br />
another internal stop. Gently continue to rotate past the stop holding the pivot point of the needle in<br />
small increments and release to see if it aligns to your mark. Continue to go back and forth until<br />
your needle is aligned. }<br />
If all you work on is the gears you do not take any screws out of the back of the unit.<br />
Dave Frye
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